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Accession Number:
AD0753646
Title:
OH-6A Phase II Quiet Helicopter Program
Corporate Author:
HUGHES TOOL CO CULVER CITY CA AIRCRAFT DIV
Report Date:
1972-09-01
Abstract:
The report presents the results of the Phase 2 Quiet Helicopter Program. A Hughes OH-6A Light Observation Helicopter was extensively modified to obtain a maximum of quieting. The purpose was to apply the latest known sound-suppression techniques available to industry to an actual helicopter and then to measure the results. An acoustic goal was set which required a balanced treatment of each noise-producing source throughout the full frequency range. Noise reductions ranged from 14 to 20 db depending on the flight conditions. The report describes the detailed configuration changes, the test and development programs, and the final sound level measurements compared to the standard OH-6A.
Descriptive Note:
Final rept. Apr 1970-Apr 1971
Supplementary Note:
DOI: 10.21236/AD0753646
Pages:
0069
Distribution Statement:
Approved for public release; distribution is unlimited.
Contract Number:
DAAJ02-69-C-0078
Contract Number 2:
ARPA ORDER-1321
File Size:
2.32MB
